"""
***************************************************************************
    r_colors.py
    -----------
    Date                 : February 2016
    Copyright            : (C) 2016 by Médéric Ribreux
    Email                : medspx at medspx dot fr
***************************************************************************
*                                                                         *
*   This program is free software; you can redistribute it and/or modify  *
*   it under the terms of the GNU General Public License as published by  *
*   the Free Software Foundation; either version 2 of the License, or     *
*   (at your option) any later version.                                   *
*                                                                         *
***************************************************************************
"""

__author__ = 'Médéric Ribreux'
__date__ = 'February 2016'
__copyright__ = '(C) 2016, Médéric Ribreux'

import os
from grassprovider.grass_utils import GrassUtils
from processing.tools.system import getTempFilename


def checkParameterValuesBeforeExecuting(alg, parameters, context):
    """ Verify if we have the right parameters """
    txtRules = alg.parameterAsString(parameters, 'rules_txt', context)
    rules = alg.parameterAsString(parameters, 'rules', context)
    if txtRules and rules:
        return False, alg.tr("You need to set either inline rules or a rules file!")

    return True, None


def processInputs(alg, parameters, context, feedback):
    # import all rasters with their color tables (and their bands)
    # We need to import all the bands and color tables of the input rasters
    rasters = alg.parameterAsLayerList(parameters, 'map', context)
    for idx, layer in enumerate(rasters):
        layerName = 'map_{}'.format(idx)
        # Add a raster layer
        alg.loadRasterLayer(layerName, layer, context, False, None)

    # Optional raster layer to copy from
    raster = alg.parameterAsString(parameters, 'raster', context)
    if raster:
        alg.loadRasterLayerFromParameter('raster', parameters, context, False, None)

    alg.postInputs(context)


def processCommand(alg, parameters, context, feedback):
    # Handle inline rules
    txtRules = alg.parameterAsString(parameters, 'txtrules', context)
    if txtRules:
        # Creates a temporary txt file
        tempRulesName = getTempFilename(context=context)

        # Inject rules into temporary txt file
        with open(tempRulesName, "w") as tempRules:
            tempRules.write(txtRules)
        alg.removeParameter('txtrules')
        parameters['rules'] = tempRulesName

    alg.processCommand(parameters, context, feedback, True)


def processOutputs(alg, parameters, context, feedback):
    createOpt = alg.parameterAsString(parameters, alg.GRASS_RASTER_FORMAT_OPT, context)
    metaOpt = alg.parameterAsString(parameters, alg.GRASS_RASTER_FORMAT_META, context)

    # Export all rasters with their color tables (and their bands)
    rasters = alg.parameterAsLayerList(parameters, 'map', context)
    outputDir = alg.parameterAsString(parameters, 'output_dir', context)
    for idx, raster in enumerate(rasters):
        rasterName = 'map_{}'.format(idx)
        fileName = os.path.join(outputDir, rasterName)
        outFormat = GrassUtils.getRasterFormatFromFilename(fileName)
        alg.exportRasterLayer(alg.exportedLayers[rasterName], fileName, True,
                              outFormat, createOpt, metaOpt)
